[cagan_ree] Update suggestions

[longye-tian]

Dear John @jstac ,

This pull request updates cagan_ree.md according to #386 .

In particular, this pull request add

• a short description of $\alpha$ as sensitivity
• Change $\tilde \gamma$ to $\gamma^*$ which is a typo

Best ❤️ Longye

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[longye-tian]

Wrong Branch will be replaced by a new pull request